<template>
  <div id="app" name="app">
    <el-container>
      <!-- 顶部导航栏 -->
      <div class="topbar">
        <div class="nav">
          <ul>
            <li v-if="!this.$store.getters.getUser">
              <el-button type="text" @click="login">登录</el-button>
              <span class="sep">|</span>
              <el-button type="text" @click="register = true">注册</el-button>
            </li>
            <li v-else>
              欢迎
              <el-popover placement="top" width="180" v-model="visible">
                <p>确定退出登录吗？</p>
                <div style="text-align: right; margin: 10px 0 0;">
                  <el-button size="mini" type="text" @click="visible = false">
                    取消
                  </el-button>
                  <el-button type="primary" size="mini" @click="logout">
                    确定
                  </el-button>
                </div>
                <el-button type="text" slot="reference">
                  {{ this.$store.getters.getUser.userName }}
                </el-button>
              </el-popover>
            </li>
            <li>
              <router-link to="/order">我的订单</router-link>
            </li>
            <li>
              <router-link to="/collect">我的收藏</router-link>
            </li>
            <li :class="getNum > 0 ? 'shopCart-full' : 'shopCart'">
              <router-link to="/shoppingCart">
                <i class="el-icon-shopping-cart-full"></i>
                购物车
                <span class="num">({{ getNum }})</span>
              </router-link>
            </li>
          </ul>
        </div>
      </div>
      <!-- 顶部导航栏END -->

      <!-- 顶栏容器 -->
      <el-header>
        <el-menu
          :default-active="activeIndex"
          class="el-menu-demo"
          mode="horizontal"
          active-text-color="#409eff"
          router
        >
          <div class="logo">
            <router-link to="/">
              <img src="./assets/imgs/logo.png" alt />
            </router-link>
          </div>
          <el-menu-item index="/">首页</el-menu-item>
          <el-menu-item index="/goods">全部商品</el-menu-item>
          <!-- <el-menu-item index="/about">关于我们</el-menu-item> -->

          <div class="so">
            <el-input placeholder="请输入搜索内容" v-model="search" @keyup.enter.native="searchClick()">
              <el-button slot="append" icon="el-icon-search" @click="searchClick"></el-button>
            </el-input>
          </div>
        </el-menu>
      </el-header>
      <!-- 顶栏容器END -->

      <!-- 登录模块 -->
      <MyLogin></MyLogin>
      <!-- 注册模块 -->
      <MyRegister :register="register" @fromChild="isRegister"></MyRegister>

      <!-- 主要区域容器 -->
      <el-main>
        <keep-alive>
          <router-view></router-view>
        </keep-alive>
      </el-main>
      <!-- 主要区域容器END -->
    </el-container>

    <ToorBar></ToorBar>

    <!-- 回到顶部 -->
    <el-backtop>
      <div
        style="
           {
            height: 100%;
            width: 100%;
            background-color: #f2f5f6;
            box-shadow: 0 0 6px rgba(0, 0, 0, 0.12);
            text-align: center;
            line-height: 40px;
            color: #1989fa;
          }
        "
      >
        <i class="el-icon-caret-top"></i>
      </div>
    </el-backtop>
  </div>
</template>

<script>
import MyLogin from '@/components/MyLogin'
import MyRegister from '@/components/MyRegister'
import ToorBar from '@/components/ToorBar'
import { mapActions, mapGetters } from 'vuex'

export default {
  components: {
    MyLogin,
    MyRegister,
    ToorBar
  },
  beforeUpdate() {
    this.activeIndex = this.$route.path
  },
  data() {
    return {
      activeIndex: '', // 头部导航栏选中的标签
      search: '', // 搜索条件
      register: false, // 是否显示注册组件
      visible: false // 是否退出登录
    }
  },
  created() {
    // 获取浏览器localStorage，判断用户是否已经登录
    if (localStorage.getItem('user')) {
      // 如果已经登录，设置vuex登录状态
      this.setUser(JSON.parse(localStorage.getItem('user')))
    }
  },
  computed: {
    ...mapGetters(['getUser', 'getNum'])
  },
  watch: {
    // 获取vuex的登录状态
    getUser: function (val) {
      if (val === '') {
        // 用户没有登录
        this.setShoppingCart([])
      } else {
        // 用户已经登录,获取该用户的购物车信息
        this.$axios
          .post('/user/shoppingCart/getShoppingCart', {
            user_id: val.user_id
          })
          .then((res) => {
            if (res.data.code === '001') {
              // 001 为成功, 更新vuex购物车状态
              this.setShoppingCart(res.data.shoppingCartData)
            } else {
              // 提示失败信息
              this.notifyError(res.data.msg)
            }
          })
          .catch((err) => {
            return Promise.reject(err)
          })
      }
    }
  },
  methods: {
    ...mapActions(['setUser', 'setShowLogin', 'setShoppingCart']),
    login() {
      // 点击登录按钮, 通过更改vuex的showLogin值显示登录组件
      this.setShowLogin(true)
    },
    // 退出登录
    logout() {
      this.visible = false
      // 清空本地登录信息
      localStorage.setItem('user', '')
      // 清空vuex登录信息
      this.setUser('')
      this.notifySucceed('成功退出登录')
    },
    // 接收注册子组件传过来的数据
    isRegister(val) {
      this.register = val
    },
    // 点击搜索按钮
    searchClick() {
      if (this.search !== '') {
        // 跳转到全部商品页面,并传递搜索条件
        this.$router.push({ path: '/goods', query: { search: this.search } })
        this.search = ''
      }
    }
  }
}
</script>

<style lang="less">
@import '@/assets/less/index.less';
</style>
